Module io.helidon.config

Package io.helidon.config

Class FileConfigSource.Builder

java.lang.Object

io.helidon.config.AbstractSourceBuilder<B,U>

io.helidon.config.AbstractConfigSourceBuilder<FileConfigSource.Builder,Path>

io.helidon.config.FileConfigSource.Builder

All Implemented Interfaces:

Builder<FileConfigSource>, ParsableSource.Builder<FileConfigSource.Builder>, PollableSource.Builder<FileConfigSource.Builder>, Source.Builder<FileConfigSource.Builder>, WatchableSource.Builder<FileConfigSource.Builder,Path>, Supplier<FileConfigSource>

Enclosing class:

FileConfigSource

public static final class FileConfigSource.Builder
extends AbstractConfigSourceBuilder<FileConfigSource.Builder,Path>
implements PollableSource.Builder<FileConfigSource.Builder>, WatchableSource.Builder<FileConfigSource.Builder,Path>, ParsableSource.Builder<FileConfigSource.Builder>, Builder<FileConfigSource>

File ConfigSource Builder.

It allows to configure following properties:

• path - configuration file path;
• optional - is existence of configuration resource optional, or mandatory (by default)?
• media-type - configuration content media type to be used to look for appropriate ConfigParser;
• parser - or directly set ConfigParser instance to be used to parse the source;

If media-type not set it tries to guess it from file extension.

Method Summary

Modifier and Type	Method	Description
FileConfigSource	build()	Builds new instance of File ConfigSource.
FileConfigSource.Builder	changeWatcher(ChangeWatcher<Path> changeWatcher)	Configure a change watcher.
FileConfigSource.Builder	config(Config metaConfig)	Configure builder from meta configuration.
FileConfigSource.Builder	mediaType(String mediaType)	Media type if this is a ParsableSource and explicit media type is configured.
FileConfigSource.Builder	parser(ConfigParser parser)	A parser if this is a ParsableSource and explicit parser is configured.
FileConfigSource.Builder	path(Path path)	Configure the path to read configuration from (mandatory).
FileConfigSource.Builder	pollingStrategy(PollingStrategy pollingStrategy)	Configure a polling strategy.

Methods inherited from class io.helidon.config.AbstractConfigSourceBuilder

mediaTypeMapping, parserMapping

Methods inherited from class io.helidon.config.AbstractSourceBuilder

optional, retryPolicy

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface io.helidon.common.Builder

get

Methods inherited from interface io.helidon.config.spi.PollableSource.Builder

pollingStrategy

Methods inherited from interface io.helidon.config.spi.Source.Builder

optional, optional, retryPolicy

Method Detail

path

public FileConfigSource.Builder path(Path path)

Configure the path to read configuration from (mandatory).

Parameters:

path - path of a file to use

Returns:

updated builder instance

config

public FileConfigSource.Builder config(Config metaConfig)

Configure builder from meta configuration.

The following configuration options are supported:

Optional configuration parameters

key	default value	description
optional	false	Configure to true if this source should not fail configuration setup when underlying data is missing.
polling-strategy	No polling strategy is added by default	Meta configuration of a polling strategy to be used with this source, add configuration to properties sub node.
change-watcher	No change watcher is added by default	Meta configuration of a change watcher to be used with this source, add configuration to properties sub node.
retry-policy	No retry policy is added by default	Meta configuration of a retry policy to be used to load this source, add configuration to properties sub node.

Media type and type mapping

media-type	Media type from loaded data is used by default for parsable config sources	Explicit media type to use, such as when a file has invalid suffix, or when we need to explicitly mark the media type.
media-type-mapping	No media type mapping is done by default	A mapping of key to a media type, allowing us to have a key that contains a sub-tree (e.g. a key that contains json data) - when we configure a mapping of the key to application/json, the data would be expanded into config as a proper tree structure

• path - path to the file containing the configuration

Overrides:

config in class AbstractConfigSourceBuilder<FileConfigSource.Builder,Path>

Parameters:

metaConfig - configuration properties used to configure a builder instance.

Returns:

modified builder instance

parser

public FileConfigSource.Builder parser(ConfigParser parser)

Description copied from class: AbstractConfigSourceBuilder

A parser if this is a ParsableSource and explicit parser is configured.

Specified by:

parser in interface ParsableSource.Builder<FileConfigSource.Builder>

Overrides:

parser in class AbstractConfigSourceBuilder<FileConfigSource.Builder,Path>

Parameters:

parser - parser configured for this source

Returns:

updated builder instance

mediaType

public FileConfigSource.Builder mediaType(String mediaType)

Description copied from class: AbstractConfigSourceBuilder

Media type if this is a ParsableSource and explicit media type is configured.

Specified by:

mediaType in interface ParsableSource.Builder<FileConfigSource.Builder>

Overrides:

mediaType in class AbstractConfigSourceBuilder<FileConfigSource.Builder,Path>

Parameters:

mediaType - media type configured for this source

Returns:

updated builder instance

changeWatcher

public FileConfigSource.Builder changeWatcher(ChangeWatcher<Path> changeWatcher)

Description copied from class: AbstractSourceBuilder

Configure a change watcher. This method must be exposed by builders of sources that change watching (WatchableSource). The type of the change watcher must match the type of the target of this source.

Specified by:

changeWatcher in interface WatchableSource.Builder<FileConfigSource.Builder,Path>

Overrides:

changeWatcher in class AbstractSourceBuilder<FileConfigSource.Builder,Path>

Parameters:

changeWatcher - change watcher to use, such as FileSystemWatcher

Returns:

updated builder instance

pollingStrategy

public FileConfigSource.Builder pollingStrategy(PollingStrategy pollingStrategy)

Description copied from class: AbstractSourceBuilder

Configure a polling strategy. This method must be exposed by builders of sources that support polling. If you see this method as being protected in your builder, the source has removed support for polling, such as ClasspathConfigSource.

Specified by:

pollingStrategy in interface PollableSource.Builder<FileConfigSource.Builder>

Overrides:

pollingStrategy in class AbstractSourceBuilder<FileConfigSource.Builder,Path>

Parameters:

pollingStrategy - polling strategy to use

Returns:

updated builder instance

build

public FileConfigSource build()

Builds new instance of File ConfigSource.

If media-type not set it tries to guess it from file extension.

Specified by:

build in interface Builder<FileConfigSource>

Returns:

new instance of File ConfigSource.